The paranoid check which verifies that the cpu_stop callback isactually called on all online cpus is completely superflous. It'sguaranteed by cpu_stop facility and if it didn't work as advertisedother things would go horribly wrong and trying to recover usingsynchronize_sched() wouldn't be very meaningful.

Kill the paranoid check. Removal of this feature is done as aseparate step so that it can serve as a bisection point if somethingactually goes wrong.